Molding-machine.



W. LEWIS & J. T. RAMSDEN.

MOLDING MAGHINE.

APPLIOATION FILED MAR. 14. 1905.

Patented June 7 2 SHEETS-SHEET 1.

J'YGJ.

INVENTORS.

WI TIIESSES I TTORNEY.

W. LEWIS & J. T. RAMSDEN.

MOLDING MACHINE.

APPLICATION FILED MAR. 14, 1905.

Patented June 7, 1910.

2 SHEETS-SHEET 2.

INVENTORSZ v w ENNW UNITED sTAtrps PATENT OFFICE.

WILFRED LEWIS AND JdHN T. RAMSDEN, OF PHILADELPHIA,' PENNSYLVANIA, .AS-'

I SIGN ORS TO THE TABOR MANUFACTURING COMPANY, OF CAMDEN, NEW' JERSEY, A

CORPORATION OF NEW ERSEY.

MOLDING-MACHINE.

Specification of Letters Patent.

Application filed March 14, 1905. Serial No. 250,023.

State of Pennsylvania, have. invented a certain new and useful Improvement in Molding-Machines, of which the following is a true and exact description, reference being had to the accompanying drawings, which form a part thereof.

()ur invention relates to that class of molding machine known as squcezers, and has for its object to generally improve the character of such mechanism, and, especially, to provide a strong and simple arrangement which can be worked by power.

The nature of our improvements will be best understood as described in connect-ion with the drawings in which they are illustrated, and .in which Figure 1, is a plan view of a machine embodying our improvements, with the ramming yoke partly cut away on the line 1-1, of Fig. Fig. 2, is a front elevation of the machine. Fig. 3, a side elevation with the ramming vokein downward position. Fig. l. a similar side elevation with the ramming yoke elevated and thrown to one side. Fig. 5, is a sectional view of the actuating cylinder. Fig. (3. a sectional iew of the special valve which we prefer to employ for regnlatin the admission and exhaust to the cylinder, said view showing the valve closed. Fig. T. is a similar view of the valve,'showing ihe'valve partly opened, and Fig. 8, is a side elevation illustrating a modification in the mechanism for guiding the ramming yoke.

A, indicates the housing or frame of the machine, the sides of which are, preferably, as shown. provided with guideways, shown as slots A, A", the portionsA, being vertical and theport-ions A, being curved oil to the-side. i

B, is the'top part of the frame connecting the grooved side members and provided with fiat extensions," as indicated at B, B, for the mold to rest upon. Y

C, is a shaft connecting the lower part of the frame and having secured to it the laterally extending arm C.

D, are wide and thin bars which form the supports for the ramming yoke E, and,

through links G, G,

'ing its lower end by preference, have their upperends 'D', formed with a thread on their narrower sides so that the yoke E, is secured in place thereon by nuts E and E the arms D, D, are at 03 and d, and the guideways A,

secured studs indicated projecting inward into guiding grooves. As shown, triangularlugs I), D, are also secured to the arms D, through the studs and connected by'a'cro'ssbar indicated at- D s F, is-a rock shaft moving in bearingsat; the top of the frame members A, and having formed on or secured to its outer ends the lever arms F F, which are connected with the studs d The H A rolls D, and D be-. mg secured on the studs so as to move in the Patented June 7,1910.

To the' lower ends of rock shaft F, has also extending from it the lever arms F, and F betwe n the lever arms F and C, a pivot arm ll. being connected to the arm F and carrying a head H, which is connected to the top of the spring while a pivot arm H connected to the arm C, carries ahead H connected with the bottom of the spring. The spring has for its function to counterbalance the weight of the ramming head and its attachments and it i. to perform its work by compression.

I, is a power cylinder connected through its head I, and arms 1 with a lever arm F, of the rock shaft, and having its piston I, connected through the piston rod 1, with the shaft C, the connection being such as to H, is a spring secured permit the turning of the piston rod on the" shaft. The upper end of the cylinder I, is connected through the hose J, and theflvalve J, with a supply pipe J for fluid under pres sure. The construction of the valve pref- 'erably used by us, and indicated at J, is shownin Figs. 6 and 7, the valve havin a casing K, and formed with a valve seat li and acylindrieal extension K above the valve seat into which opens' a port K, connected with the pipe J The lower end of this casing is connected througlia head K with the supply pipe J.

L, is a hollow plunger working in the eylindrical portion K", of the casing and-havreduced' in diameter, as indicated at L, and lateral escape orifices L leading from the top of its central perforation. The head of the plunger is preferably formed as indicated at L, and the arranged 21S SllOWl] S0 {IS pad M, extends in line with the bottom'of hold the valve in contact with its seat;

best shown in F igs.- 3 and 4, is a 'piv ot for the valve lever O, which is formed with a lug O restin in contact with the plunger head L. The ever is also rovided with an extension 0 whichexten 5 out toward the rock shaft, as shown, and'the rock shaft has formed on or secured to it a stop lug P, with which the end of the lever extension 0 comes in contact when the rock shaft is in the position shown in Fi 4 and which holds the lever from accomp ishing' its full downward stroke until the rock. shaft has rotated through a definite part of its movethe plunger. A spring N, acts to normalg 7 ment for purposes which will be described.

In the modification bestv shown in Fig. -8, the yoke su porting bars D, are shown. as guided in a hlock Q, one such block situated on each side of the housing, the said block having a guideway, indicated at Q, for the bars, and being connected with the housing through the links Q Q, which, in the position shown in the drawings, rest on stationary lugs Q, but which are able to move up when the pins, indicated at Q, on the bot-- toms of the bars D, come in contact with the bottoms of the guide blocks Q.

It will be seen in Fig. 4, which-shows the ramming yoke" in retracted position, that the yoke head is swung toone side by means of the en agement of the rollers on the bars D, with t e guideways A, A. It will also be seen that when pressure fluid is admitted to the cylinder I, that the arm F and the rock shaft F,are rotated in an anti-clockwise direction, the sprin H, com ressed and the arms F turne downwar their motion being communicated throu h thelinks G to the yoke supports D, which, in their downward motioit, arebrought to a vertical position and thus guided vertically downward bringing the yoke .down 'u on the mold resting on the tables 13'. he heavy yoke E, in its lateral movements, exerts a gooddeal of strain on the supporting bars D, which are preferably made wide and thin with their broader'faces in the direction of the lateral movement and we have found that the yokecan'be-securely attached to these wide-and thin bars by the. simple expedient of threadingthe narrow-edges of the tops of these bars and clarnprn the yokes thereto by the nuts E, and as .the valve.

beam

shown. It is highly important in this articular, or an other ower driven mac in'e of the kind t at the ateral movements in1-' parted to the ramming yokeshould not be so quick as to expose the machine to undue strains, and we have therefore or anized our machine sothat the pressure uid is admitted to the cylinder first through a narrow or choked orifice and after the yoke and its arms have assumed a vertical position, with. the full force necessary to the proper ramming of the mold, and to accomplis this function as well as to provide a thoroughly suitable valve for our machine we have devised the valve and its connections which are shown in the drawings. It will'be seen that, in normal position, as shown in Fig. 6, the pressure fluid is cut ofl from the actuating cylinder, and the cylinder opened to exhaust through the hollow plunger L. When it is desired to admit pressure fluid to the cylinder the plunger is presseddown until its longitudinal orifice is' closed by comin in contact with the valve M and the va ve pressed down, as shown in Fig. 7. 'In this osition the piston like extension M, of t e valve affords a choke connection for the pressure fluid to the cylinder and by pressing the valve still farther down a'fulladmission of pressure ,fluid is provided for. Our machine provides automatically for the proper operation of The valve actuating lever 0', being prevented from making its full opening stroke at the beginnin of the ramming operation by the contact 0? its extension 0 with the stop P, on the rock shaft, therefore the first operation of pressing down the valve lever is to 0 en the restricted assage to the cylinder which with proper sl dwness brings the yoke to its vertical osition, the movement of the rock shaft shifiting the stop P, until it clears the lever extension 0, permitting the full opening of the valve and the prompt and forcible application of full power to the ram.

During the ramming stroke, the lever arms 13 move toward the osition in which they are in alinement wit the line of action of the connterbulancing spring and the lever tion of the piston and cylinder. In conseuence, the efi'ectiveleverage on the rock 3 aft exerted by the s rin decreases and that of the' piston an -cy inder increases during the ramming stroke.

In, the modification shown in F 8, it

will be seen' that the block Q, gui the yoke through its vertical movements and that when at the end of the vertical upward movement ofthe yoke the stop pins Q come in contact with the bottoms of the locks Q, the said blocks will be raised and guided by the links Q and Q, into an oblique po- Mm F moves away from the position in which it is in alinement with the line of acsition thus ett'ectin the movement of the ramming yoke, as s own in Fig. 4. The reverse movement of the rock shaft restores the blocks Q, to position shown in Fig. 8,

where the links Q}, and Q, rest on the stops a ramming yoke in combination with means for ositi vel v guiding said yokethrough a straight pat 1 during the act of ramm1m and through a divergent curved path during a portion of its return stroke, a rock shaft supported on the machine housing, connections from the rock shaft to actuate the'raniming yoke, a ,cylinder and piston connection to actuate the rock shaft, means for admitting and exhausting pressure fluid from said cylinder, and a countcrbalancing spring acting through compression to balance some or all of the weight of the yoke and its attachments.

'2. In amolding machine, a ramming yoke in combination with means for positively guiding said yoke through a straight path during the act divergent curved path during a portion of of ramming and through a its return stroke, a rock shaft supported on the machine housing, lever arms attached to said shaft and connected to actuate the yoke, lever arms F, and F also attached to-the shaft, :1 cylinder and piston connected to actuate the rock shaft through arm I, and a countcrbalancing spring connected with the shaft through arm l*-'.

3. In a molding machine having a ramming yoke and power cylinder for actuating said yoke, a ,valve governing the admission and exhaust from said cylinder. in combination with a regulating stop shifted in accordance with the movements of the yoke. said stop acting to prevent the full opening of the valve to admit fluid to the cylinder until the yoke has moved through a portion of its working stroke.

4. In a molding machine having a ramnnng yoke and a power cylinder ing said yoke, a valve .l. situated in the conduitfor pressure -tluid. said valve having in combination a casing K. with seat K, and cylindrical extension K", and ulltlct K, leading to the cylinder, a valve M, normally seated on seat K, a plunger L, moving in cylinder K and formed with an outlet pas sage, means for normally holding the for actuate plunger out of contact with the valve and means for pressing the plunger down on the valve to open it and close the outlet passage.

In a molding machine having a ramming yoke and a power cylinder for actuating said yoke, a valve J, situated in the condu'it for pressure fluid, said valve having in combination a casing K, with seat K, an? cylindrical extension Kfl-and outlet K, leat ing to the cylinder,'a yfilve 1M, normally seated on seat Ki avpltmger L, moving in cylinder K and formed with an outlet passage, means for normally holding the plunger out of contact with the valve, a

lever O','for pressing the plmwcr down on the valve, and a movable stop hifting with the movements of the yoke and acting to prevent the full movement of the lever 0', until the yoke has moved through a portion of its working stroke.

in combination with means for guiding said yoke during the ramming and return strokes, a rock shaft supported on the machine housing, lcvcr arms attached to said shaftand connected to actuate the yoke, a cylinder and i stroke.

3 l. In a moldmg machine, a housing or frame having two parallel guideways formcd in'it, each gmdeway having a lower vc'rtical portion and an upper diverging portion. in combination with a ramming yoke having two downwardly extending arms, each with a portion adjacent one of the gnidc\\'a \'s, each arm being provided with t wo guides entering the corresponding guidei way and arranged one above the other so that the ramming yoke moves in a straight line when the guides are in the lower vertical portions of the guideways, and is moved 5 in a diverging curved path when the upper guides on the arms move into the diverging portions of the guidcwavs.

\VILFRED LIHVIS. JOHN T. RAHSDEU.

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(3. In a molding machine, a ramming yoke piston connected to said shaft for actuating 

